National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Illinois Valley Regional Airport (KVYS)

Lat: 41.35°NLon: 89.15°WElev: 650ft.

Fair

64°F

18°C

Humidity 88%
Wind Speed Calm
Barometer 30.06 in
Dewpoint 61°F (16°C)
Visibility 10.00 mi
Last update 29 Jul 11:18 pm CDT
Extended Forecast for

Marseilles IL

  • Tonight

    Tonight: Patchy fog after 3am. Otherwise, mostly clear, with a low around 59. Calm wind.

    Low: 59 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 8am. Otherwise, sunny, with a high near 85. Calm wind becoming southwest around 5 mph.

    High: 85 °F

    Patchy Fog
    then Sunny

  • Thursday Night

    Thursday Night: Mostly cloudy, with a low around 66. Calm wind.

    Low: 66 °F

    Mostly Cloudy

  • Friday

    Friday: A chance of showers, then showers and possibly a thunderstorm after 1pm. High near 78. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.

    High: 78 °F

    Chance
    Showers then
    Showers

  • Friday Night

    Friday Night: Showers and possibly a thunderstorm. Low around 66. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.

    Low: 66 °F

    Showers

  • Saturday

    Saturday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 78. Chance of precipitation is 60%.

    High: 78 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 64.

    Low: 64 °F

    Slight Chance
    Showers

  • Sunday

    Sunday: Mostly sunny, with a high near 81.

    High: 81 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

Detailed Forecast

Tonight
Patchy fog after 3am. Otherwise, mostly clear, with a low around 59. Calm wind.
Thursday
Patchy fog before 8am. Otherwise, sunny, with a high near 85. Calm wind becoming southwest around 5 mph.
Thursday Night
Mostly cloudy, with a low around 66. Calm wind.
Friday
A chance of showers, then showers and possibly a thunderstorm after 1pm. High near 78. South southeast wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
Friday Night
Showers and possibly a thunderstorm. Low around 66. East wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%.
Saturday
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Mostly cloudy, with a high near 78. Chance of precipitation is 60%.
Saturday Night
A 20 percent chance of showers before 1am. Partly cloudy, with a low around 64.
Sunday
Mostly sunny, with a high near 81.
Sunday Night
Mostly clear, with a low around 62.
Monday
Sunny, with a high near 83.
Monday Night
Mostly clear, with a low around 65.
Tuesday
Sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 68.
Wednesday
A chance of showers and thunderstorms. Mostly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Marseilles IL
 41.33°N 88.68°W
Last Update:
8:31 pm CDT Jul 29, 2026
Forecast Valid:
11pm CDT Jul 29, 2026-6pm CDT Aug 5, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation